guindon



' A. GUINDON.

COMPUTING MACHINE.

APPLICATION FILED JULY I5 1920. 1 41 194 Patented May 16, 1922.

2 SHEETS-SHEET 1.

MTV

A. GUINDON.

COMPUTING MACHINE.

. APPLICATION FILED JULYIS, 1920. 1,416,194, Patented May 16, 1922 2 SHEETSSHEET 2.

ALEXANDRE GUIN'DON, 0F ROGKLAND, ONTARIO; CANADA.

COMPUTING- MACHINE.

Specification of LettersPatent. PatentedMa 16;,1922;

Application filed July 15, 1920: Serial No. 396,415.

To all whom z'tmag concern:

Be it known that .1. l-LLnXANnnn GUIND N,

a subject of Great Britaiin, and resident of R'ockland. in the Province of Ontario, Do-

minion of Canada, haveinvented certain new and useful Improvements in Computing lllaohines; o fiywhich the following is a specification.

This invention relates to improvements in computing; machines, and the objects of the invention are to construct a m'achinewhich is simple and effective and in which arithmetical calculations such as multiplication can berapidly performed to render the several. parts easily. accessible for inspection, and generally to adapt the machine to better perform the functions required ofit.

lVith the above and other objects inview, theinvention consists essentially of the improved construction and arrangement of parts particularly described and set forth in tlie following specification andaccom panying drawings-formingpart of thesame.

Iirthe drawings Figure 1 is a perspectiveview of the improved computing. machine.

Fig.2 is a transverse section of the same.

Figure3is an enlargedplaniview of the roller-which shows the methods of computing tensandhundreds and the pointermechanism cooperating with the said roller.

Figure 4 :is a fragmentary side elevation showing the lever means for actuating the pointer .illustrated: in Figure 3.

Figure 5 is a side'elevationot the gearing controlling the rotation of thed-r'um.

Figure 6 is a plan view of the same.

Figure 7 is a perspective view of the drum, Figure 8 is a perspectiveview of. the adjustable stop mechanism which coacts with the drum actuating lever.

Like characters of reference refer to like parts in the several figures.

Referring to the drawings: A. represents the improved computing machine comprising a casing 10, in which the drum 12 is rotatably mounted, the drum spindle 13 being provided with a gear 14 thereon. The gear 14 meshes with a gear 15 mounted on an intermediate spindle 16 which also carries a pair of ratchet wheels 17 and 18, the teeth of which are disposed in opposite directions.

A lever 19 is mounted on the spindle 16 and carries a pair of detents 20 and 21 designed to coact with the ratchet wheels 17 and 18 respectively, and the detents 20 and 21 are actuated by the =rods:22 and. 23 which are connected to the hand grips-24e and 25 pivotally attached to the: upper; end-.015 the hand lever 19. i l lever 26 is pivotally mounted in the casing and has anrofiiset end 27 designed to bemoved into engagement withithe gear 15 as will hereinafteribeexplained. v

The spindle 16 carries a. gear 28 which meshes with the gear 29and thegeari29 is mounted on a spindle 80 which is movable so that the said gears may be unmeshed' if such is found necessary.

Thespindle 30 is provided with a threaded end 31 carrying a pointerBQ which overhangs a roller 33 mounted on a trameil l adjacent to the casing 10. The spindle 16 is engaged by a U-shaped member 35.which is pivotally attached to the lever 36- and this lever is in turn pivoted to the frameB i.

Asthe lever 36 is rocked, the gear 29 will bemoved into or out of mesh with the gear 28. 1

A pair of levers 37 are provided pivotally. mounted inthe casing 10and carrying a stop member 38, and these leversare formed of resilient material and coact withthespaced arcuate racks 39 also mounted in the casing 10. I i In the casing 10 a rectangular orifice 40 1S1JIOV1Cl6Cl in which thelevers 37 and 19 operate and a second rectangular orifice 41 is provided in which the lever 26 operates.

The drum 12 is graduated being divided by .arcuate lines and longitudinal lines into squares each of which are numbered. and an index 4.2 is provided slidably mounted above the slot 43 in the CS SlHQlQ andbehindthis index 42 a plate id is provided. which is also numbered.

One side of the orifice i0 is also numbered as shown at. a I v When the machine is in use, and adeter- .inination has to be made, then-theoperator moves the index 42 to that denomination which the price of an article is given and he then actuates the levers 37 to bring them to the number by which this price is to be multiplied.

He then actuates the lever 19 and rotates a drum 12 and the result of the multiplica tion may be read oil on that portion of the drum visible just above the index 42.

If a second multiplication is tobe made of the result obtained by another number, then the operator actuates the lever 26 to engage the offset end 27 with the gear 15 so that he holds the drum against rotation and then resets the lever 19 to its zero position.

The levers 37 are now adjusted until they coincide with the number by which the last results is to be multiplied. The operator now releases the lever 26 and actuates the lever 19 to rotate the drum 12 through a further step and the result of this multiplication is then read of]? at the index 4:2.

It the result of the multiplication will be such that the numbers could not be obtained on the large drums 12, then the operator actuates the lever 36 to throw the gear 29 into mesh with the gear 28 and on the rotation of the spindle 16 by the lever 19 then the spindle 30 will be rotated and the pointer moved along the graduated drum 33 allowing tens or hundreds to be read oil on the said drum while smaller denominations such as units could be read oil on the larger drum 12.

From the above description it will be seen that I have invented a computing; machine in which ordinary arithmetical calculations may be made with rapidity and accuracy.

r-rs many changes could be made in the above construction and many widely different embodiments of my invention within the scope oi the claims, constructed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawings shall be interpreted as illustrative and not in a limiting sense.

What I claim as my invention isz---- l. A computing machine comprising a casing, a drum rotatably uioimted in the casing and having symbols on its periphery, a spindle, gears connecting the spindle with the drum, a pair of ratchet wheels on the spindle having oppositely disposed teeth, a hand lever, detents carried by the lever to coact with the teeth, means tor simultaneously actuating; the detents, a lever pivoted within the casing and having an oti'set end designed to engage one of the gears, a gear on the said spindle, a second spindle movable in a direction transversely to its length and having a gear to coact with the last said gear, a pointer threaded. on the last said. spindle and a roller having graduations thereon underlying the pointer.

2. A computing machine comprising a casing, provided with a longitudinal slot, a F

drum rotatably mounted in the casing, and having symbols on its periphery, a spindle, gears connecting the spindle with the drum, a pair oil? ratchet wheels on the spindle havino' opposite y disposed teeth, a hand lever, detents carried by the lever to coact with the teeth, means for simultaneously actuating; the detents, lever pivoted within the casing, and having an offset end designed to engage one oi. the gears, a gear on the said spindle, a second spindle movable in a direction transversely to its length, and having a gear to coact with the last said gear, a pointer threaded on the last said spindle, and a roller having graduations thereon underlying the pointer, an arcuate rack on the casing, a lever coacting with the rack and provided with a stop member designed to be engaged by the hand lever, substantially as and for the purpose descri bed.

3. A computing; machine (1(JIl'lp1.lSll1 a casing, provided with a longitiulinal slot, a drum rotatably mounted in the casing; and having syinbols on. its periphery, a i-spindle, gears connecting; the spindle with the drum, a pair of ratchet wheels on the spindle having oppositely disposed teeth, a hand lever, detcnts carried by the lever to coact with the teeth, means lior simiiltanemisly actuating the detents, a lever pivoted within the easing, and havii'ig an oilset end designed to engage one ol' the gears-s, a gear on the said spindle, second spindle movable in a direction transversely to its length, and having a gear to coact with the last said gear, a pointer threaded on the last said spindle. a roller having graduations thereon underlyinn; the pointer, guide inen'ibers along the edges of the longitudinal slot and an index slidably engag ng with the guide members, an arcuate rack on the casing, a lever coacting with the rack and provided with stop member designed to be engaged by the hand lever, sulr, ntially as and tor the purpose described.

in witness whereol I have hm'eunto set my hand in the presence of two witnesses. ALE-EA ti DP It (l ill ll DON.

/Vitnesses Maui 15. Knox, ETHEL Ganaow. 

